Ответ:
12•(x+9x)=480
12•10x=480
10x=480:12
10x=40
x=40:10
x=4
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120х=480
Х=480:120
Х=4
Ответ:
12•(x+9x)=480
12•10x=480
10x=480:12
10x=40
x=40:10
x=4